ZnO/Au-based surface plasmon resonance for CO2 gas sensing application

A brief overview of recent trends in Surface Plasmon Resonance (SPR) technology especially for gas sensing is presented. Some novel sensors (metallic grating, MIM, optical fiber) are discussed along with the development of plasmonic nanostructure based on zinc oxide (ZnO) for enhancing sensing application.

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Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE)

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.8.56 ◽

2017 ◽

Vol 8 ◽

pp. 522-529 ◽

Cited By ~ 1

Author(s):

Daniel Fischer ◽

Andreas Hertwig ◽

Uwe Beck ◽

Volkmar Lohse ◽

Detlef Negendank ◽

...

Keyword(s):

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Gas Sensors ◽

Tin Oxide ◽

Plasmon Resonance ◽

Binding Sites ◽

Gas Sensing ◽

Iron Doping ◽

Actual Surface ◽

Gas Measurement

Background: Gas sensors are very important in several fields like gas monitoring, safety and environmental applications. In this approach, a new gas sensing concept is investigated which combines the powerful adsorption probability of metal oxide conductive sensors (MOS) with an optical ellipsometric readout. This concept shows promising results to solve the problems of cross sensitivity of the MOS concept. Results: Undoped tin oxide (SnOx) and iron doped tin oxide (Fe:SnOx) thin add-on films were prepared by magnetron sputtering on the top of the actual surface plasmon resonance (SPR) sensing gold layer. The films were tested for their sensitivity to several gas species in the surface plasmon resonance enhanced (SPREE) gas measurement. It was found that the undoped tin oxide (SnOx) shows higher sensitivities to propane (C3H8) then to carbon monoxide (CO). By using Fe:SnOx, this relation is inverted. This behavior was explained by a change of the amount of binding sites for CO in the layer due to this iron doping. For hydrogen (H2) no such relation was found but the sensing ability was identical for both layer materials. This observation was related to a different sensing mechanism for H2 which is driven by the diffusion into the layer instead of adsorption on the surface. Conclusion: The gas sensing selectivity can be enhanced by tuning the properties of the thin film overcoating. A relation of the binding sites in the doped and undoped SnOx films and the gas sensing abilities for CO and C3H8 was found. This could open the path for optimized gas sensing devices with different coated SPREE sensors.

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Surface Plasmon Resonance of SnO2/Au Bi-layer Films for Gas Sensing Applications

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2010.01.054 ◽

2010 ◽

Vol 145 (2) ◽

pp. 832-838 ◽

Cited By ~ 32

Author(s):

Dongfang Yang ◽

Hui-Hsin Lu ◽

Bo Chen ◽

Chii-Wann Lin

Keyword(s):

Surface Plasmon Resonance ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Gas Sensing ◽

Sensing Applications

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CH3NH3PbBr3 Thin Film Served as Guided-Wave Layer for Enhancing the Angular Sensitivity of Plasmon Biosensor

Biosensors ◽

10.3390/bios11110415 ◽

2021 ◽

Vol 11 (11) ◽

pp. 415

Author(s):

Leiming Wu ◽

Yuanjiang Xiang ◽

Yuwen Qin

Keyword(s):

Thin Film ◽

Surface Plasmon Resonance ◽

Gas Sensor ◽

Surface Plasmon ◽

Plasmon Resonance ◽

Gas Sensing ◽

Hybrid Structure ◽

Guided Wave ◽

Angular Sensitivity ◽

Liquid Sensing

CH3NH3PbBr3 perovskite thin film is used as a guided-wave layer and coated on the surface of an Au film to form the Au-perovskite hybrid structure. Using the hybrid structure, a perovskite-based guided-wave surface plasmon resonance (GWSPR) biosensor is proposed with high angular sensitivity. First, it is found that the electric field at the sensing interface is improved by the CH3NH3PbBr3 perovskite thin film, thereby enhancing the sensitivity. The result demonstrates that the angular sensitivity of the Au-perovskite-based GWSPR biosensor is as high as 278.5°/RIU, which is 110.2% higher than that of a conventional Au-based surface plasmon resonance (SPR) biosensor. Second, the selection of the coupling prism in the configuration of the GWSPR biosensor is also analyzed, and it indicates that a low refractive index (RI) prism can generate greater sensitivity. Therefore, the low-RI BK7 prism is served as the coupling prism for the proposed GWSPR biosensor. Finally, the proposed GWSPR sensing structure can not only be used for liquid sensing, but also for gas sensing, and it has also been demonstrated that the GWSPR gas sensor is 2.8 times more sensitive than the Au-based SPR gas sensor.

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